US Bridges

CR 646 (grn Vl Rd) over Loantaka Brook

Fair

Morris County, New Jersey · 0.9MI SW CR646&CR647 JCT · Structure no. 1400506

Built
1936
89 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
38 ft
1 main span
Daily traffic
6,512
2023 count
Owner
County
County Highway Agency

About this bridge

CR 646 (grn Vl Rd) over Loantaka Brook is a steel stringer/multi-beam or girder carrying CR 646 (grn Vl Rd) over Loantaka Brook in Morris County, New Jersey. It was built in 1936, so it is 89 years old, older than the New Jersey average of 58.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 6,512 vehicles a day, roughly 3% of them trucks, projected to reach 7,946 by 2043. The structure is 38 ft (11.6 m) long and 50 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCR 646 (grn Vl Rd)
CrossesLoantaka Brook
Location0.9MI SW CR646&CR647 JCT
RouteCounty Highway 646
CountyMorris County
StateNew Jersey
Coordinates40.7385, -74.44602
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating67 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length38 ft (11.6 m)
Longest span36 ft (11 m)
Deck width50 ft (15.2 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,512 (2023)
Projected traffic7,946 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$243,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 646 (grn Vl Rd) over Loantaka Brook built?

It was built in 1936, making it 89 years old in 2025.

What condition is CR 646 (grn Vl Rd) over Loantaka Brook in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does CR 646 (grn Vl Rd) over Loantaka Brook carry?

About 6,512 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is CR 646 (grn Vl Rd) over Loantaka Brook?

The structure is 38 ft (11.6 m) long with a longest span of 36 ft (11 m) and a deck 50 ft wide.

Who owns CR 646 (grn Vl Rd) over Loantaka Brook?

It is owned by the County Highway Agency.